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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 | /* * fs/cifs/smb2transport.c * * Copyright (C) International Business Machines Corp., 2002, 2011 * Etersoft, 2012 * Author(s): Steve French (sfrench@us.ibm.com) * Jeremy Allison (jra@samba.org) 2006 * Pavel Shilovsky (pshilovsky@samba.org) 2012 * * This library is free software; you can redistribute it and/or modify * it under the terms of the GNU Lesser General Public License as published * by the Free Software Foundation; either version 2.1 of the License, or * (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See * the GNU Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public License * along with this library; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include <linux/fs.h> #include <linux/list.h> #include <linux/wait.h> #include <linux/net.h> #include <linux/delay.h> #include <linux/uaccess.h> #include <asm/processor.h> #include <linux/mempool.h> #include <linux/highmem.h> #include <crypto/aead.h> #include "smb2pdu.h" #include "cifsglob.h" #include "cifsproto.h" #include "smb2proto.h" #include "cifs_debug.h" #include "smb2status.h" #include "smb2glob.h" static int smb2_crypto_shash_allocate(struct TCP_Server_Info *server) { return cifs_alloc_hash("hmac(sha256)", &server->secmech.hmacsha256, &server->secmech.sdeschmacsha256); } static int smb3_crypto_shash_allocate(struct TCP_Server_Info *server) { struct cifs_secmech *p = &server->secmech; int rc; rc = cifs_alloc_hash("hmac(sha256)", &p->hmacsha256, &p->sdeschmacsha256); if (rc) goto err; rc = cifs_alloc_hash("cmac(aes)", &p->cmacaes, &p->sdesccmacaes); if (rc) goto err; return 0; err: cifs_free_hash(&p->hmacsha256, &p->sdeschmacsha256); return rc; } #ifdef CONFIG_CIFS_SMB311 int smb311_crypto_shash_allocate(struct TCP_Server_Info *server) { struct cifs_secmech *p = &server->secmech; int rc = 0; rc = cifs_alloc_hash("hmac(sha256)", &p->hmacsha256, &p->sdeschmacsha256); if (rc) return rc; rc = cifs_alloc_hash("cmac(aes)", &p->cmacaes, &p->sdesccmacaes); if (rc) goto err; rc = cifs_alloc_hash("sha512", &p->sha512, &p->sdescsha512); if (rc) goto err; return 0; err: cifs_free_hash(&p->cmacaes, &p->sdesccmacaes); cifs_free_hash(&p->hmacsha256, &p->sdeschmacsha256); return rc; } #endif static struct cifs_ses * smb2_find_smb_ses_unlocked(struct TCP_Server_Info *server, __u64 ses_id) { struct cifs_ses *ses; list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) { if (ses->Suid != ses_id) continue; return ses; } return NULL; } struct cifs_ses * smb2_find_smb_ses(struct TCP_Server_Info *server, __u64 ses_id) { struct cifs_ses *ses; spin_lock(&cifs_tcp_ses_lock); ses = smb2_find_smb_ses_unlocked(server, ses_id); spin_unlock(&cifs_tcp_ses_lock); return ses; } static struct cifs_tcon * smb2_find_smb_sess_tcon_unlocked(struct cifs_ses *ses, __u32 tid) { struct cifs_tcon *tcon; list_for_each_entry(tcon, &ses->tcon_list, tcon_list) { if (tcon->tid != tid) continue; ++tcon->tc_count; return tcon; } return NULL; } /* * Obtain tcon corresponding to the tid in the given * cifs_ses */ struct cifs_tcon * smb2_find_smb_tcon(struct TCP_Server_Info *server, __u64 ses_id, __u32 tid) { struct cifs_ses *ses; struct cifs_tcon *tcon; spin_lock(&cifs_tcp_ses_lock); ses = smb2_find_smb_ses_unlocked(server, ses_id); if (!ses) { spin_unlock(&cifs_tcp_ses_lock); return NULL; } tcon = smb2_find_smb_sess_tcon_unlocked(ses, tid); spin_unlock(&cifs_tcp_ses_lock); return tcon; } int smb2_calc_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server) { int rc; unsigned char smb2_signature[SMB2_HMACSHA256_SIZE]; unsigned char *sigptr = smb2_signature; struct kvec *iov = rqst->rq_iov; struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)iov[1].iov_base; struct cifs_ses *ses; ses = smb2_find_smb_ses(server, shdr->SessionId); if (!ses) { cifs_dbg(VFS, "%s: Could not find session\n", __func__); return 0; } memset(smb2_signature, 0x0, SMB2_HMACSHA256_SIZE); memset(shdr->Signature, 0x0, SMB2_SIGNATURE_SIZE); rc = smb2_crypto_shash_allocate(server); if (rc) { cifs_dbg(VFS, "%s: shah256 alloc failed\n", __func__); return rc; } rc = crypto_shash_setkey(server->secmech.hmacsha256, ses->auth_key.response, SMB2_NTLMV2_SESSKEY_SIZE); if (rc) { cifs_dbg(VFS, "%s: Could not update with response\n", __func__); return rc; } rc = crypto_shash_init(&server->secmech.sdeschmacsha256->shash); if (rc) { cifs_dbg(VFS, "%s: Could not init sha256", __func__); return rc; } rc = __cifs_calc_signature(rqst, server, sigptr, &server->secmech.sdeschmacsha256->shash); if (!rc) memcpy(shdr->Signature, sigptr, SMB2_SIGNATURE_SIZE); return rc; } static int generate_key(struct cifs_ses *ses, struct kvec label, struct kvec context, __u8 *key, unsigned int key_size) { unsigned char zero = 0x0; __u8 i[4] = {0, 0, 0, 1}; __u8 L[4] = {0, 0, 0, 128}; int rc = 0; unsigned char prfhash[SMB2_HMACSHA256_SIZE]; unsigned char *hashptr = prfhash; memset(prfhash, 0x0, SMB2_HMACSHA256_SIZE); memset(key, 0x0, key_size); rc = smb3_crypto_shash_allocate(ses->server); if (rc) { cifs_dbg(VFS, "%s: crypto alloc failed\n", __func__); goto smb3signkey_ret; } rc = crypto_shash_setkey(ses->server->secmech.hmacsha256, ses->auth_key.response, SMB2_NTLMV2_SESSKEY_SIZE); if (rc) { cifs_dbg(VFS, "%s: Could not set with session key\n", __func__); goto smb3signkey_ret; } rc = crypto_shash_init(&ses->server->secmech.sdeschmacsha256->shash); if (rc) { cifs_dbg(VFS, "%s: Could not init sign hmac\n", __func__); goto smb3signkey_ret; } rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash, i, 4); if (rc) { cifs_dbg(VFS, "%s: Could not update with n\n", __func__); goto smb3signkey_ret; } rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash, label.iov_base, label.iov_len); if (rc) { cifs_dbg(VFS, "%s: Could not update with label\n", __func__); goto smb3signkey_ret; } rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash, &zero, 1); if (rc) { cifs_dbg(VFS, "%s: Could not update with zero\n", __func__); goto smb3signkey_ret; } rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash, context.iov_base, context.iov_len); if (rc) { cifs_dbg(VFS, "%s: Could not update with context\n", __func__); goto smb3signkey_ret; } rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash, L, 4); if (rc) { cifs_dbg(VFS, "%s: Could not update with L\n", __func__); goto smb3signkey_ret; } rc = crypto_shash_final(&ses->server->secmech.sdeschmacsha256->shash, hashptr); if (rc) { cifs_dbg(VFS, "%s: Could not generate sha256 hash\n", __func__); goto smb3signkey_ret; } memcpy(key, hashptr, key_size); smb3signkey_ret: return rc; } struct derivation { struct kvec label; struct kvec context; }; struct derivation_triplet { struct derivation signing; struct derivation encryption; struct derivation decryption; }; static int generate_smb3signingkey(struct cifs_ses *ses, const struct derivation_triplet *ptriplet) { int rc; rc = generate_key(ses, ptriplet->signing.label, ptriplet->signing.context, ses->smb3signingkey, SMB3_SIGN_KEY_SIZE); if (rc) return rc; rc = generate_key(ses, ptriplet->encryption.label, ptriplet->encryption.context, ses->smb3encryptionkey, SMB3_SIGN_KEY_SIZE); if (rc) return rc; rc = generate_key(ses, ptriplet->decryption.label, ptriplet->decryption.context, ses->smb3decryptionkey, SMB3_SIGN_KEY_SIZE); if (rc) return rc; #ifdef CONFIG_CIFS_DEBUG_DUMP_KEYS cifs_dbg(VFS, "%s: dumping generated AES session keys\n", __func__); /* * The session id is opaque in terms of endianness, so we can't * print it as a long long. we dump it as we got it on the wire */ cifs_dbg(VFS, "Session Id %*ph\n", (int)sizeof(ses->Suid), &ses->Suid); cifs_dbg(VFS, "Session Key %*ph\n", SMB2_NTLMV2_SESSKEY_SIZE, ses->auth_key.response); cifs_dbg(VFS, "Signing Key %*ph\n", SMB3_SIGN_KEY_SIZE, ses->smb3signingkey); cifs_dbg(VFS, "ServerIn Key %*ph\n", SMB3_SIGN_KEY_SIZE, ses->smb3encryptionkey); cifs_dbg(VFS, "ServerOut Key %*ph\n", SMB3_SIGN_KEY_SIZE, ses->smb3decryptionkey); #endif return rc; } int generate_smb30signingkey(struct cifs_ses *ses) { struct derivation_triplet triplet; struct derivation *d; d = &triplet.signing; d->label.iov_base = "SMB2AESCMAC"; d->label.iov_len = 12; d->context.iov_base = "SmbSign"; d->context.iov_len = 8; d = &triplet.encryption; d->label.iov_base = "SMB2AESCCM"; d->label.iov_len = 11; d->context.iov_base = "ServerIn "; d->context.iov_len = 10; d = &triplet.decryption; d->label.iov_base = "SMB2AESCCM"; d->label.iov_len = 11; d->context.iov_base = "ServerOut"; d->context.iov_len = 10; return generate_smb3signingkey(ses, &triplet); } #ifdef CONFIG_CIFS_SMB311 int generate_smb311signingkey(struct cifs_ses *ses) { struct derivation_triplet triplet; struct derivation *d; d = &triplet.signing; d->label.iov_base = "SMBSigningKey"; d->label.iov_len = 14; d->context.iov_base = ses->preauth_sha_hash; d->context.iov_len = 64; d = &triplet.encryption; d->label.iov_base = "SMBC2SCipherKey"; d->label.iov_len = 16; d->context.iov_base = ses->preauth_sha_hash; d->context.iov_len = 64; d = &triplet.decryption; d->label.iov_base = "SMBS2CCipherKey"; d->label.iov_len = 16; d->context.iov_base = ses->preauth_sha_hash; d->context.iov_len = 64; return generate_smb3signingkey(ses, &triplet); } #endif /* 311 */ int smb3_calc_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server) { int rc = 0; unsigned char smb3_signature[SMB2_CMACAES_SIZE]; unsigned char *sigptr = smb3_signature; struct kvec *iov = rqst->rq_iov; struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)iov[1].iov_base; struct cifs_ses *ses; ses = smb2_find_smb_ses(server, shdr->SessionId); if (!ses) { cifs_dbg(VFS, "%s: Could not find session\n", __func__); return 0; } memset(smb3_signature, 0x0, SMB2_CMACAES_SIZE); memset(shdr->Signature, 0x0, SMB2_SIGNATURE_SIZE); rc = crypto_shash_setkey(server->secmech.cmacaes, ses->smb3signingkey, SMB2_CMACAES_SIZE); if (rc) { cifs_dbg(VFS, "%s: Could not set key for cmac aes\n", __func__); return rc; } /* * we already allocate sdesccmacaes when we init smb3 signing key, * so unlike smb2 case we do not have to check here if secmech are * initialized */ rc = crypto_shash_init(&server->secmech.sdesccmacaes->shash); if (rc) { cifs_dbg(VFS, "%s: Could not init cmac aes\n", __func__); return rc; } rc = __cifs_calc_signature(rqst, server, sigptr, &server->secmech.sdesccmacaes->shash); if (!rc) memcpy(shdr->Signature, sigptr, SMB2_SIGNATURE_SIZE); return rc; } /* must be called with server->srv_mutex held */ static int smb2_sign_rqst(struct smb_rqst *rqst, struct TCP_Server_Info *server) { int rc = 0; struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)rqst->rq_iov[1].iov_base; if (!(shdr->Flags & SMB2_FLAGS_SIGNED) || server->tcpStatus == CifsNeedNegotiate) return rc; if (!server->session_estab) { strncpy(shdr->Signature, "BSRSPYL", 8); return rc; } rc = server->ops->calc_signature(rqst, server); return rc; } int smb2_verify_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server) { unsigned int rc; char server_response_sig[16]; struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)rqst->rq_iov[1].iov_base; if ((shdr->Command == SMB2_NEGOTIATE) || (shdr->Command == SMB2_SESSION_SETUP) || (shdr->Command == SMB2_OPLOCK_BREAK) || (!server->session_estab)) return 0; /* * BB what if signatures are supposed to be on for session but * server does not send one? BB */ /* Do not need to verify session setups with signature "BSRSPYL " */ if (memcmp(shdr->Signature, "BSRSPYL ", 8) == 0) cifs_dbg(FYI, "dummy signature received for smb command 0x%x\n", shdr->Command); /* * Save off the origiginal signature so we can modify the smb and check * our calculated signature against what the server sent. */ memcpy(server_response_sig, shdr->Signature, SMB2_SIGNATURE_SIZE); memset(shdr->Signature, 0, SMB2_SIGNATURE_SIZE); mutex_lock(&server->srv_mutex); rc = server->ops->calc_signature(rqst, server); mutex_unlock(&server->srv_mutex); if (rc) return rc; if (memcmp(server_response_sig, shdr->Signature, SMB2_SIGNATURE_SIZE)) return -EACCES; else return 0; } /* * Set message id for the request. Should be called after wait_for_free_request * and when srv_mutex is held. */ static inline void smb2_seq_num_into_buf(struct TCP_Server_Info *server, struct smb2_sync_hdr *shdr) { unsigned int i, num = le16_to_cpu(shdr->CreditCharge); shdr->MessageId = get_next_mid64(server); /* skip message numbers according to CreditCharge field */ for (i = 1; i < num; i++) get_next_mid(server); } static struct mid_q_entry * smb2_mid_entry_alloc(const struct smb2_sync_hdr *shdr, struct TCP_Server_Info *server) { struct mid_q_entry *temp; if (server == NULL) { cifs_dbg(VFS, "Null TCP session in smb2_mid_entry_alloc\n"); return NULL; } temp = mempool_alloc(cifs_mid_poolp, GFP_NOFS); memset(temp, 0, sizeof(struct mid_q_entry)); kref_init(&temp->refcount); temp->mid = le64_to_cpu(shdr->MessageId); temp->pid = current->pid; temp->command = shdr->Command; /* Always LE */ temp->when_alloc = jiffies; temp->server = server; /* * The default is for the mid to be synchronous, so the * default callback just wakes up the current task. */ temp->callback = cifs_wake_up_task; temp->callback_data = current; atomic_inc(&midCount); temp->mid_state = MID_REQUEST_ALLOCATED; return temp; } static int smb2_get_mid_entry(struct cifs_ses *ses, struct smb2_sync_hdr *shdr, struct mid_q_entry **mid) { if (ses->server->tcpStatus == CifsExiting) return -ENOENT; if (ses->server->tcpStatus == CifsNeedReconnect) { cifs_dbg(FYI, "tcp session dead - return to caller to retry\n"); return -EAGAIN; } if (ses->status == CifsNew) { if ((shdr->Command != SMB2_SESSION_SETUP) && (shdr->Command != SMB2_NEGOTIATE)) return -EAGAIN; /* else ok - we are setting up session */ } if (ses->status == CifsExiting) { if (shdr->Command != SMB2_LOGOFF) return -EAGAIN; /* else ok - we are shutting down the session */ } *mid = smb2_mid_entry_alloc(shdr, ses->server); if (*mid == NULL) return -ENOMEM; spin_lock(&GlobalMid_Lock); list_add_tail(&(*mid)->qhead, &ses->server->pending_mid_q); spin_unlock(&GlobalMid_Lock); return 0; } int smb2_check_receive(struct mid_q_entry *mid, struct TCP_Server_Info *server, bool log_error) { unsigned int len = get_rfc1002_length(mid->resp_buf); struct kvec iov[2]; struct smb_rqst rqst = { .rq_iov = iov, .rq_nvec = 2 }; iov[0].iov_base = (char *)mid->resp_buf; iov[0].iov_len = 4; iov[1].iov_base = (char *)mid->resp_buf + 4; iov[1].iov_len = len; dump_smb(mid->resp_buf, min_t(u32, 80, len)); /* convert the length into a more usable form */ if (len > 24 && server->sign && !mid->decrypted) { int rc; rc = smb2_verify_signature(&rqst, server); if (rc) cifs_dbg(VFS, "SMB signature verification returned error = %d\n", rc); } return map_smb2_to_linux_error(mid->resp_buf, log_error); } struct mid_q_entry * smb2_setup_request(struct cifs_ses *ses, struct smb_rqst *rqst) { int rc; struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)rqst->rq_iov[1].iov_base; struct mid_q_entry *mid; smb2_seq_num_into_buf(ses->server, shdr); rc = smb2_get_mid_entry(ses, shdr, &mid); if (rc) return ERR_PTR(rc); rc = smb2_sign_rqst(rqst, ses->server); if (rc) { cifs_delete_mid(mid); return ERR_PTR(rc); } return mid; } struct mid_q_entry * smb2_setup_async_request(struct TCP_Server_Info *server, struct smb_rqst *rqst) { int rc; struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)rqst->rq_iov[1].iov_base; struct mid_q_entry *mid; smb2_seq_num_into_buf(server, shdr); mid = smb2_mid_entry_alloc(shdr, server); if (mid == NULL) return ERR_PTR(-ENOMEM); rc = smb2_sign_rqst(rqst, server); if (rc) { DeleteMidQEntry(mid); return ERR_PTR(rc); } return mid; } int smb3_crypto_aead_allocate(struct TCP_Server_Info *server) { struct crypto_aead *tfm; if (!server->secmech.ccmaesencrypt) { tfm = crypto_alloc_aead("ccm(aes)", 0, 0); if (IS_ERR(tfm)) { cifs_dbg(VFS, "%s: Failed to alloc encrypt aead\n", __func__); return PTR_ERR(tfm); } server->secmech.ccmaesencrypt = tfm; } if (!server->secmech.ccmaesdecrypt) { tfm = crypto_alloc_aead("ccm(aes)", 0, 0); if (IS_ERR(tfm)) { crypto_free_aead(server->secmech.ccmaesencrypt); server->secmech.ccmaesencrypt = NULL; cifs_dbg(VFS, "%s: Failed to alloc decrypt aead\n", __func__); return PTR_ERR(tfm); } server->secmech.ccmaesdecrypt = tfm; } return 0; } |